Let's see it this way: after the Brexit, what's the point for Europeans to stick to the British variant of English? While UK-English is the Real Mccoy, it hurts my eyes to read things like 'colour', 'honour'... or watch them drive on the wrong side of the road. But that's just me. Others think it's charming, classy, etc.albeit in a quirky way, juste like Olde English in the King James Bible, Shakespeare ... must appear to us today: quaint, but charming.

Personally, I tend to prefer “colour” over “color”, as an example, but it seems “color” is far more widely used. Should I avoid being pedantic favouring GB English? Is US English the lingua franca?

At school, did you learn US English or GB English?

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Favoring or favouring? :') If you like GB English, just go for it! It's not pedantic, it just tells more about who you are and the choices you make
I chose GB english and my boss who speaks US english said I had a "lovely accent". Don't be afraid to make a statement If people around you don't like it, then so be it! And you'll have less issues with the writing part as someone else previously put it